[Paraview] 3D surface plot with x yz data

[Bryn Lloyd]

Hi All,


Is there a way to set a field data array to be the active 
scalars/vectors in ParaView?


For instance in the tube filter, I would like to tell pv which data 
array to use to vary the radius by scalar.

Maybe there are also other filters, which use the field data and by 
default take the active one.
By default the active one seems to be the first one, I think.

Any hints would be appreciated,

Bryn